Class VI. SHELLS. 79 



M. with a brittle half-tranfparent (hell, with a hinge DedivL. 

 (lightly prominent ; lefs gaping than the truncata •, ^ L 

 near the open end Hoping downwards. 



Frequent about the Hebrides -, the fifti eaten by 

 the gentry. 



M. Arenaria. Lin. Sjft. 1 112. Faun. Suec. No. 2127. Arenaria. 



16. Sand* 



M. with a tooth like the former ; mouth large, 

 rough at the bafe^ the whole fhell of an ovated 

 figure, and much narrower at the gaping end. 



Three inches and a half broad - 3 two inches long 

 in the middle. Tab. xlii. 



M. Pittorum. Lin. Sjft. 1112. Faun. Snec. No. 2IQ. Lift. Pifiorum, 

 Angl. App. tab. i. Jig. 4. 1 7. Paint- 



ers. 



M. with an oval brittle fhell-, with a fingle longi- 

 tudinal tooth like a lamina in one fhell, and two in 

 the other. Tab. xliii. Jig. 1 7. 



Breadth a little above two inches ; length one. 



Inhabits rivers. 



Ufed to put water-colors in ; whence the name. 

 Otters feed on this and the other frefh- water fhells. 



Lin. 



